Keystones — Capstone
Five GCSE retrieval questions · 29 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² - 9x
Answer: (x - 9⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 21cm, angle = 48°. Give your answer to 2 decimal places
Answer: 148.26cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 54:30:25 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 57, 76, 66, 47, 69, 75. Give your answer to 2 decimal places
Answer: Mean = 65.14, Median = 66, Range = 29